BAKER HUGHES - Drilling Fluids Reference Manual

RESERVOIR APPLICATION FLUIDS
V e = Estimated volume brine (bbl)
3. Using data from the formulation tables, determine the following:
D o = Brine density (lb/gal)
W o = bbl water/bbl
Cl o = lb 94% CaCl 2 /bbl
Br o = lb 95%/bbl
4. Determine amount of fresh water incorporated into system:
W
V e(
D o – D d )
d = -------------------------------
D o – 8.335
5. Determine materials required to increase density back to the original density:
CaCl 2 required
=
W d
W o
( )Cl
-------------------- o
CaBr 2 required
=
W d
( )Br
-------------------- o
W o
Final volume
=
V e
+ W d
---------------------
W o
Example
400 lbs of a 14.5 lb/gal brine while being used in a well became diluted with fresh water. The
density of the diluted brine was found to be 14.1 lb/gal and the volume estimated at 450 bbl. How
much CaCl 2 and CaBr 2 are required to increase density back to the original?
Vo = 400 bbl
Ve = 450 bbl
De = 14.1 lb/gal
D o = 14.5 lb/gal
W o = .718 bbl
Cl o = 121.3 lb
Br o = 248.9 lb
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 6-47